Clean up obsolete resources and update documentation

- Remove all DynamoDB-related scripts and data files
- Remove AWS SDK dependencies from scripts
- Update environment files to remove DynamoDB/Lambda references
- Update PROJECT_STRUCTURE.md to reflect current architecture
- Clean up Terraform variables and examples
- Add PLA Matte to special pricing (3999 RSD / 3499 RSD refill)
- Make all table columns sortable
- Remove old Terraform state backups
- Remove temporary data import files

config/environments.js

@@ -2,15 +2,11 @@
 const environments = {
   development: {
     name: 'development',
-    apiUrl: process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3000/api',
-    dynamoTableName: 'filamenteka-filaments-dev',
-    awsRegion: 'eu-central-1'
+    apiUrl: process.env.NEXT_PUBLIC_API_URL || 'https://api.filamenteka.rs/api'
   },
   production: {
     name: 'production',
-    apiUrl: process.env.NEXT_PUBLIC_API_URL,
-    dynamoTableName: 'filamenteka-filaments',
-    awsRegion: 'eu-central-1'
+    apiUrl: process.env.NEXT_PUBLIC_API_URL
   }
 };